摘要
通过V4Fe对Mn的替代 ,系统研究了储氢合金TiMn1.2 5-5yCr0 .2 5(V4Fe) y(y =0 ,0 .0 2 ,0 .0 4 ,0 .0 6 ,0 .0 8)的储氢性能。XRD结果显示 :合金为C14型Laves相结构 ,合金的晶胞参数随着V4Fe量的增加而增大。PCT结果表明 :适量的V4Fe替代Mn可增加合金的储氢量 ,降低平衡压和减少滞后。退火处理可使合金的相结构均匀化 ,进一步改善合金的储氢性能。TiMn0 .95Cr0 .2 5(V4Fe) 0 .0 6合金在 12 2 3K下退火处理 6h后 ,最大和有效储氢量分别为 2 .0 %和 1.75 % (质量分数 ) ,且滞后效应小 ,适合于作为质子交换膜燃料电池的供氢源。
The reversible hydrogen absorption and desorption behavior of TiMn_(1.25-5y)Cr_(0.25)(V_4Fe)_y (y=0, 0.02, 0.04, 0.06, 0.08) was investigated by substitution for partial Mn at 273 K, 293 K and 313 K. XRD results show that the alloys have C14 Laves phase structure and with increasing content, the lattice paramters of alloy are increased. PCT results show that substitution can increase the hydrogen storage capacity, decrease the plateau pressure and the hysteresis of the PCT. However, it can also increase the slope of the PCT. After being annealed at 1 223 K for 6 h, TiMn_(0.95)Cr_(0.25)(V_4Fe)_(0.06) alloy has a low desorption plateau pressure (1.04×10~5 Pa at 273 K and 2.72×10~5 Pa at 313 K) and a small hysteresis (0.14 at 273 K and 0.12 at 313 K). The maximum and effective hydrogen storage capacities are 2.0% and 1.75%(mass fraction) respectively, which are suitable for hydrogen storage tanks in PEMFC.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第5期1116-1120,共5页
The Chinese Journal of Nonferrous Metals
基金
国家 8 63计划资助项目 (2 0 0 1AA5 15 0 2 2 )
关键词
储氢量
平衡压
滞后
退火
储氢合金
AB1.5型
hydrogen storage capacity
TiMn_(1.25-5y)Cr_(0.25)(V_4Fe)_y
plateau pressure
hysteresis
annealing
